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src/components/SettingToggle.vue

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+<template>
+  <a v-on:click="toggleSetting()" class="navbar-item is-inline-block-mobile">
+    <span v-show="value"><i :class="['fas', icon]"></i></span>
+    <span v-show="!value"><i :class="['fas', iconAlt]"></i></span>
+    <slot></slot>
+  </a>
+</template>
+
+<script>
+export default {
+  name: "SettingToggle",
+  props: {
+    name: String,
+    icon: String,
+    iconAlt: String,
+  },
+  data: function () {
+    return {
+      value: true,
+    };
+  },
+  created: function () {
+    if (!this.iconAlt) {
+      this.iconAlt = this.icon;
+    }
+
+    if (this.name in localStorage) {
+      this.value = JSON.parse(localStorage[this.name]);
+    }
+
+    this.$emit("updated", this.value);
+  },
+  methods: {
+    toggleSetting: function () {
+      this.value = !this.value;
+      localStorage[this.name] = this.value;
+      this.$emit("updated", this.value);
+    },
+  },
+};
+</script>